Device for balancing bodies capable of alpha rising and falling movement



Q Dec. 1, 1931. H. R. WEBB ET AL SING AND FALLING MOVEMENT OriginalFiled June 8, 1929 DEVICE FOR BALANCING BODIES CAPABLE OF -A RI IiiK157170183 HR. 175 .617. H1? Wfifi.

Blfl g JTTUBWHS 0 specificationin connection Patented Dec. 1, 1931UNITED ST ES PATENT OFFICE j- HARRY RILEY WEBB A D HARRY NEWTON WEBB, orGRANTHAM, ENGLAND DEVICE FOR IBALANCING" BODIES CAPABLE OF .A RISING ANDFALLING MOVEMENT Original application filed June 8, 1929, Serial No.369,477. Divided. and this 1930. Serial No. 461,245.

This invention comprises an improved de- 10 exerted by the balancingmeans at successive positions throughout the range of movement of thebody, said means comprising, inone instance, a chain adapted to be.wound onto or from a rotatablespring actuated drum, the

5 position taken up by the chain links on passing onto orfrom said drumcausing a cyclic variationin themoments'iof the forces applied to thedrum by the weight of the drum to be balanced.

The principal object of the present invention is to providemeanswherebya compensating efi'ect maybe obtainedin respect of the forces exertedbythe balancing means at different positions in the movement of thebody, in addition to the above referred to periodic or cyclic variationsin the moments of the force applied to the balancing means by the weightof the body.

A further object is to do away with th necessity of independent lockingmechanism in connection with displaceable bodies and to provide meanswhereby the body to be balanced may be moved to the desired positionwhereupon, if necessary, an automatic movement takes placeto suchposition that equilibrium between the opposing forces is attaineoL- g Astill further object of the present invention is to provide means of asimple and cheaply constructed nature functioning to maintain aneffective balance at successive and separated positions throughout therange of movement of the body. j

Further objects areattained bythe novel construction and arrangement ofthe parts forming the subject of the present invention, which objects.will be more fully apparent after consideration of the. accompanyingwiththe attached drawings wherein application filed June 14,

Fig. 1 represents a diagrammatic elevation of a traversable windowincorporating balancing mechanism in accordance with the presentinvention and,

Fig. 2 is an end View of Fig. 1.

The attached drawings represent byway of example the application of abalancing device to a movable window such for example as those employedin automobiles although the invention is not to be regarded as limitedto this purpose.

A rotatable drum 1 is provided below the window 2 and is accommodatedupon a stationary spindle 3 carried in bearing brackets 4 and-5 attachedto a channel portion 6 secured along the lower edge of the window 2. Acoil or similar spring 7 is arranged interiorly of the drum 1 beingconnected at one end to said drum and at the other end to the stationaryspindle 8 and-in this manner a rotational force is imparted to thedrum 1. A chain 8 isprovided secured at one end to the outer surface ofthe drum 1 and connected at its free end to a stationary transversecrossbar 9 disposed above the drum 1 in all positions of the window 2.On displacement of the window 2 said chain 8 is wound progressively ontoor from the drum 1 and it will be appreciated that the spring?interiorly of such drum, imparts a lifting action to the window 2 byvirtue of the chain 8 being connected to the stationary cross-bar 9above the drum.

On displacement of the window 2 the separate links of the chain 8 passonto or from the drum 1 and cyclic variations are produced in themoments of the force applied by'the weight of the window 2 to the spring7 interiorly of the drum 1 and the arrangement is such that theeifective balancing force exerted by the spring 7 always liesintermediate the upper and lower moments of such cyclic variation; aslong .as this condition is fulfilled it will be appreciated thatequilibrium between the opposed forces, comprising the weight of thewindow 2 and that exerted by the spring 7 may be attained.

The links of the chain 8 are of progressively increasing thickness,those of greatest thickness beingat the end of the chain sefor a risingand falling movement by balanccured to the drum and the thickness of thelinks decreasing to a minimum at the end of the chain secured to thetransverse bar 9. From a consideration of Fig. 2 it will be appreciatedthat there is an additional progressive, i. e. non-cyclic variation inthe moments of the forces applied to the balancing spring 7 interiorlyof the drum 1 in accordance with the position of the window 2 in itsmovement. This progressive changegis due to the progressively varyingdistances between the points of articulation of the adjacent links andthe centre of the drum 1 as the chain is wound onto or from the drum.

By suitably proportioning the sizes of'the chain links it is possible tocompensate for the increasing balancing force of the spring 7 as samebecomes more highly tensioned -while it will further be appreciated thatthis progressive va iation is additional to the cyclic variationproduced in the moments of the forces applied to sprin 7 by thedilferent angular positions taken up by the separate links as they passonto orfrom the drum 1. The combination of the two sorts of variationsin the moments of the force applied to spring 7 results in a cyclicvariation having progressively varying upper and lower limits.

Preferably, the arrangement is such that the range of cyclic variationin the moments of the forces applied to the drum 1 is only comparativelysmall while the progressive variation in the upper and lower limits ofsuch cyclic variation is arranged to compensate for the-variation in thebalancing force exerted by the spring 7 as same becomes more highlytensioned. The function of the cyclic variation in the moments of theforces applied to the spring 7 may in thiscase largely reside in theprevention of undesired displacement of the window 2, such as that dueto vibrational influences.

Claims: 7

11 A device for balancing bodies adapted ing means exerting aninconstant balancing force comprising a chain having links ofprogressively increasing thickness, means for applying the balancingforce and the force due to the weight of the body to be balanced to theopposite ends of said chain and means whereby, on displacement of thebody to be balanced, said chain is passed progressively over a smoothelement.

2. A device for balancing bodies adapted element causing a cyclicvariation in the moments of the forces applied to the balancing means bythe weight of the body to be balanced.

3. A device for balancing bodies adapted for a rising and fallingmovement by balancfora rising and falling movement by balancingme'ans'exerting an inconstant balancing force comprlsing a' chain ha-vmglinks of progressively increasing thickness, aspring actuated drum ontowhich the said chain may be progressively wound, a relatively stationaryattachment above said drum to which the free end of said chain isconnected, and nleans for mounting said drum below the body to bebalanced so as to be displaceable therewith, .the position taken up bythe 1 chain links around said spring actuated drum causing a combinedcyclic and a progressive non-cyclic variation in the moments of theforces applied to the balancing'spring by the weight of the body to bebalanced.

' 5. A device'for balancing bodies adapted for a rising and falling.movement by balancing means exerting an inconstantbalancing,forceromprising a chain, having links ofprogressivelyincreasingthickness, a sta-i tionary spindle below'the bodyto be balanced and displaceable therewith, a rotatable drum mounted onvsaid spindle, a spring mounted interiorly of said drum tending to rotatesame to cause a lifting force to be imparted to the body to be balanced,means for securing one' end of said chain to the outer surface of sa'iddrum and a stationary attachment above thespring actuated drum to whichthe free end of said chain is connected, the positions taken up by thechain links around said drum on' displacement of the body causing acombined cyclic and a progressive non-cyclic variation in the moments ofthe forcesapplied to the balancing spring by the weight of the body tobe balanced. v I

6. A'device for balancing bodies adapted for a rising and, fallingmovement by balancing means exerting an inconstant balancingforcecomprising a chain having links of progressively increasing thickness,means for applying the opposed forces to the opposite ends of said chainand means whereby said'chain is passed progressivelyover a smoothcircular element, the positions taken up by the chain links on passingover said element causing a cyclic variation in the moments of theforces applied to the balancing means by the Weight of the body to bebalanced, and the efi'ective force exerted by the balancing means alwayslying intermediate the limits of such cyclic variation.

7. A device for balancing bodies adapted for a rising and fallingmovement by balancing means exerting an inconstant balancing forcecomprising a chain having links of progressively increasing thickness, aspring actuated drum onto which said chain is progressively Wound and astationary attachment above the spring actuated drum to which the freeend of said chain is connected, the positions taken up by the chainlinks around the drum causing a combined cyclic and a gradualprogressive, that is, non-cyclic, variation in the moments of the forcesapplied to the spring interiorly of the drum by the Weight of the bodyto be balanced, and the effective force exerted by the balancing meansalways lying intermediate the limits of such cyclic variation.

HARRY RILEY WEBB.

HARRY NEWTON WEBB.

